1887

Abstract

In A3(2), mutants that lack the tRNA for the rare leucine codon UUA fail to make the red undecylprodigiosin antibiotic complex. To find out why, red-pigmented while bald (Pwb) derivatives of a mutant were isolated. Using a cloning strategy that allowed for (and demonstrated) dominance of the mutations, they were localized to the gene cluster. By using insert-mediated integration of a ?C31 phage-based vector, one of the Pwb mutations was more precisely located between structural genes to a segment of approximately 1 kb about 4 kb from the known pathway-specific regulatory gene The segment contained most of an ORF () encoding a protein (RedZ) with end-to-end similarity to response regulators of diverse function from a variety of bacteria. Remarkably, in RedZ hydrophobic residues replace nearly all of the charged residues that usually make up the phosphorylation pocket present in typical response regulators, including the aspartic acid residue that is normally phosphorylated by a cognate sensory protein kinase. A single TTA codon in provided a potential explanation for the -dependence of undecylprodigiosin synthesis. This codon was unchanged in three Pwb mutants, but further analysis of one of the mutants revealed a potential up-promoter mutation. It seems possible that a combination of low-level natural translation of the UUA codon by a charged non-cognate tRNA, coupled with increased transcription of in the Pwb mutant, allows the accumulation of a threshold level of the RedD protein.

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1998-03-01
2021-05-13
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